Continuity mistake: When Warren visits Tally's apartment for the first time, he says something to her just before he is leaving, he then opens the door. The next shot is of Tally - look behind her and in the corner of the room there is a mirror, you can see Warren walking up to the door again and opening it and walking out - 6 seconds after he has already done it.
Continuity mistake: One of Warren's colleagues shows the new weather-custom: a yellow raincoat. In the close-up you see his right hand grabbing a beeper. A second later his hand is near his neck, holding the beeper.